After a few days the problem disappeared. No idea what happened.
In case someone else struggles with the same issue this may be useful:
After the recent huge Antergos update I’ve gotten into real trouble. One of the packages broke my desktop so I started rolling back to previous versions. I fixed that but then suddenly Pacman stopped working. Now I’m getting a segmentation fault error. I’ve tried searching for the solution but nothing really helps. Has anyone else experienced that? I’d be grateful for any help.
[options] HoldPkg = pacman glibc Architecture = auto CheckSpace SigLevel = Required DatabaseOptional LocalFileSigLevel = Optional [antergos] SigLevel = PackageRequired Include = /etc/pacman.d/antergos-mirrorlist [core] Include = /etc/pacman.d/mirrorlist [extra] Include = /etc/pacman.d/mirrorlist [community] Include = /etc/pacman.d/mirrorlist [multilib] Include = /etc/pacman.d/mirrorlist